Re: Thunderbird sc exhaust
If your looking for better flow (and sound), how about just removing the mufflers all together.
I used to have dual flowmasters (50 series, I think) on my 96 thunderbird 4.6l.
The sound was good, but not what I was going for, I was looking for that classic car rumble.
I left the flowmasters on for about 4 years, until my fuel pump went out.
To replace the fuel pump I first had to remove the exhaust (at the connection just before the gas tank) to get to the fuel pump (which is in the top of the tank).
Anyways as I was testing the fuel pump I started the car to make sure I was getting fuel to the engine and all of my electrical connectors were on good.
I decided, just for fun, to take the car around the block without the exhaust on.
Oh man did it sound AWESOME! It reminds me of a hot rodded classic car. And it sounds even better when you open the throttle up. This is the sound I was looking for when I had my flowmasters installed.
Engine runs better without the mufflers on em, and I have had no problems from doing this, no check engine lights or anything, it runs great without them.
I haven't had mufflers on for over a year, and have never had any issues related to the mufflers being off. Not even a ticket for how throaty the car now sounds.
If you do this, just keep the exhaust in the garage so you can put it back on when it comes time for a smog check.